1211244420 has 48 divisors (see below), whose sum is σ = 3403108800. Its totient is φ = 321891456.

The previous prime is 1211244409. The next prime is 1211244467. The reversal of 1211244420 is 244421121.

It is a super-2 number, since 2×1211244420² = 2934226089962272800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16870 + ... + 52029.

It is an arithmetic number, because the mean of its divisors is an integer number (70898100).

Almost surely, 2^1211244420 is an apocalyptic number.

1211244420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211244420 is an abundant number, since it is smaller than the sum of its proper divisors (2191864380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211244420 is a wasteful number, since it uses less digits than its factorization.

1211244420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69204 (or 69202 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

The square root of 1211244420 is about 34802.9369450338. The cubic root of 1211244420 is about 1065.9674164918.

Adding to 1211244420 its reverse (244421121), we get a palindrome (1455665541).

The spelling of 1211244420 in words is "one billion, two hundred eleven million, two hundred forty-four thousand, four hundred twenty".